A zoo in a Philadelphia suburb is investigating the unexpected death of a young red panda.

The Elmwood Park Zoo in Norristown said the red panda, named Clinger, died on Nov. 29. An animal autopsy did not provide a cause of death, zoo officials said.

"Although only here a short time, Clinger made a definite impact among all of us that cared for him and all of you that came to visit him. He will be deeply missed," Elmwood Park Zoo said in a Facebook post.